No veins but a large black dot in the egg??

I was going through the incubator and pitching infertile eggs, blood rings e.c.t. and i came across an egg that looked infertile from the top, but i couldn't find the air cell, so i turned it around and found out it was upside down for 7 days, and i saw this black unmoving dot that looked like an embryo and it was stuck to the side, there were defiantly no veins, should i keep it or just pitch it?

1. Clear when candled - probably infertile
(or very early death) when candled at 1/3 of the
incubation period.2. Fertile with red blood vessels - after 1/3 of the
incubation period.3. Red or black staining - early death when candled
after 1/3 of the incubation period.4. Embryo with red blood ‘ring’ - early death when
candled after 1/3 of the incubation period.5. Dark outline with ill defined detail - late death
(1/2 or 2/3 through incubation period).6. Live embryo with bill in air sack - due to hatch in​